Glass-working apparatus and process



F. L. U. WADSWORTH.

GLASS WORKING APPARATUS AND PROCESS.

APPLICATION FILED APR- P42, 1914.

z SHEETS-SHEET 1.

Putmlt'ed J lily 29 F. l.. 0. WADSWGRTHA GLASS WORKING APPARATUS ANDPROCESS,

APPLICATION FILED APR. 24, |914.

1,3 l 1 ,474. Pzllmmd July 2), 191).

2 SHEETS-SHEET 2.

NETE@ STATE@ PATENT @FFQE@ `IBRIAN'K L. 0. WADSWORTH, 0F PITTSBURGH,PENNSYLVANIA, ASSIGNOR '130v BALL BROTHERS GLASS MANUFACTURING COMPANY,0F MLUNCIE, INDIANA, A COR- PORATION 0F INDEANA.

GLASS-WORKING APPARATUS AND PROCESS. l

193319474. specification of Letters raamt. pmmmejgmy 299 1919,

\'\ Application filed April 24, 1914:. Serial No. 834,230.'

To all whom t may concern:

Be it known that l, FRANK L. O. VVADS- WORTH, a citizen of the UnitedStates, residing at Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and use-ful Glass-Working Apparatusand Process, of which the following is a specification.

My invention relates generally to 1mprovements in the art ofautomatically charging a. series of molds or forming receptacles withpredetermined quantities of molten glass delivered thereto directly froma melting furnace or other large source of supply. The invention relatesmore specifically to the automatic charging ofv such molds by means ofaflowing stream of glass whiich is allowed to pass directly from thefurnace to the receptacle until the required quantity has beendelivered, and is then, for a short time, arrested in its flow in suchmanner as to entirely prevent any piling up or lapping of the arrestedstream or the entraining of air or gas bubbles therein.

When a stream of glass or other 'similar thermoplastic material isdelivered from a source of supply, especially when that delivery takesplace through a downwardly presented opening or orifice, there is asurface chilling of the stream throughout its entire length, thissurface chilling resulting, immediately adjacent and below the dischargeorifice in a conical shell, the base of which, immediately adjacent theorifice, is of appreciable thickness and of considerably less plasticitythan the interior of the stream, the thickness and character of thisshell depending. very largely, of course, upon the character of theglass,

its initial temperature as it emerges from the furnace, and theatmospheric temperature. Through this tubular shell the main body of thestream of glass flows, the downward velocity of the middle of the streambeing greater than the exterior. I have discovered that when a stream ofglass is severed, as above described, at a point fairly close to thedelivery orifice, the momentary chilling at the cutting plane results inthe completion of an inclosing stream-retarding envelop for thedepending end of the stream, the slight chilling resulting from thecutting operation connecting up with the chilled skin or shell which isdepending,l

from the discharge orifice. The exact distance of the cutting plane fromthe orifice will, of course, depend upon the size of thedepending fromthe orifice will not contain a sufficient mass of molten metal toovercome the surface tension and viscosity of the material, and the flowwill not-be properly reestablished after the severing operation. Whencut at too low a point the mass of depending material will be too greatand the downward flow will be resumed before a sufficient interval haselapsed for the removal of the filled mold and the bringing of an emptymoldsuch as 34to the requiredv charging position. But by adjusting theplane of the cut by the up-ward or downward movement of the apparatus apoint can be always found where the physical causes tending to controlthe resumption of the flow of the severed stream will so cooperate as tosupport the globular mass depending from the orifice Q- fora sufficientlength of time to permit of the necessary mold movements, and will thenallow the stream to resume its flow to the next mold.

The method by which I secure the last described result consistsessentially in severing the flowing stream at a point near the orificeor open-ing from which it emerges; then immediately subjecting both thesevered end and thc adjacent sides of the streamV to a momentarysul-face chilling action whereby the downward flow of the moltenmaterial is stopped by the joint effect. of the said surface chilling;and then removing the chilling means allowing the internal vheat of themetal to remelt or resoften the chilled skin so that a downward flowwill be restablished. r1`he chilling may be accompanied by pressure onthe plastic glass, if desired. The mechanical means by which thisprocess may be carried out are varied, and the practice of the methoddepends not on the use 0f any particular form of mechanism 'but on theutilization of the characteristic properties of molten glass at itsnormal Working temperature.

In the drawings, Figure 1 illustrates in partial sectional elevation oneform of mechanism suitable for the practice of my invention; Fig. 2 is asimilar view showing the stream arresting parts in closed position; Fig.'3 is a plan view of a second form of apparatus adapted to carry out myimproved method; Figs. 4 and 5 are detail sectional views of the streamarresting parts of the second form of apparatus when it is in its closedposition; Fig. 6 is a partial plan view of a mold table mechanismsuitable for use with my improved stream arresting device; Fig. 7 is apartial sectional elevation, of a more or less diagrammatic character,taken on the line X--X of Fig. 6; Fig. 8 is a detail view of a portionof the apparatus at the time the movement of the stream is arrested; andFig. 9 is a plan view of a part of the mechanism shown in Fig. 8.

In Fig. 1, which shows one form of apparatus convenient for carrying outmy improved method, 1 indicates a flow block chamber or dog houseextension communieating with a melting tank or other large supplyreceptacle containing 'the molten glass; and which is provided in itsbottom with an orifice 2 through which the stream of molten materialfiows downwardly to the series of molds 4, 4, as they are broughtsuccessively to the Icharging position in a manner later'to bedescribed. Just below the orice 2 I place the stream-severing andstream-arresting device, which, in the present instance, consistsessentially of two reciprocating blocks 5 and 6 and a shear blade 9. Theblocks 5 and 6 are provided on their adjacent surfaces with conedcavities 7 and 8 s0 shaped that when the blocks are brought together, asshown in Fig, 2, the sides of these cavities make contact with the sidesof the glass stream, issuing from the orifice 2, and limit theenlargement of that stream when its How is arrested. The lower ends ofthese cavities 7 and 8 are coned at a less angle than the upper portionsthereof so that when the blocks are brought together as just indicatedthe lower end of the stream will not be caught between the sides of theblocks and the latter prevented from closing. The final and completeAclosure of the opening., which effects the severance of the stream ofglass, is effected by the reciprocating shear blade .9 which has amotion independent of that of the block 6.

l'The blocks 5 and 6 are each slidably supported on a frameA 10, and areconnected together in such manner as to be moved simultaneously andequally in opposite directions by the action of idle pinions 11 mountedon a fixed shaft 12 and engaging with racks 13 and 14 attachedrespectively to the blocks 5 and 6.

Motion is imparted to the blocks, and to the shear blade 9, by theaction of pistons 15 and 16 in the cylinder 17.- The mainpiston 15 iscoupled directly to the support of the block 6 by the rod 18, while theauxiliary piston 16, which is slidably mounted in the main piston 15, isindependently connected to the shear 'blade 9y by! the Vpiston rod 19.Both pistons are normally heldin their retracted position in thecylinder by springs 2O and 21. The fiow of the actuating fluid,compressed air or steamrfor example, to the cylinder 17 is controlled bya three-way Valve 22, the stem of which is moved by the joint action ofa constantly rotating cam 23 (coupled to the main driving shaft of themold carrying not shown] machine by a shaft 24) and spring 25.

. The molds 4, 4 which are to be successively supplied with moltenmaterial, may

be brought one after the other to the charg-` ing position below theorifice 2 in any approved manne-r. In order to diminish the timerequired tobring the molds in succession to the charging position, whichcorresponds approximately to the time during which the flow of theglass' stream must be arrested, I prefer to employ mold actuatingmechanism of such character that the empty receptacles are brought inturn directly under the charging position, as indicated in dotted linesin Fig. 1, and are then raised vertically to said charging positionwhile the filled mold is being moved laterally to one side (see Fig. 2).The more complete description of one form of apparatus for effectingsuch a movement of the molds will be found below.

The operation of the device illustrated in Figs. l and 2 is as follows:W'ith a mold in the charging position indicated in full lines in Fig. 1,the stream of glass is allowed to flow directly downward from theorifice 2 into a receptacle until a. sufficient quantity has.acoumul-ated therein for the forma-tion of the desired article. The stemof the three-way valve 22 is then actuated 'by the raised portion of thecam 23 thereby admitting compressed air (or steam or other actuatingfluid) to the cylinder 17 and moving the main piston 15 to the rightagainst the pressure of the spring 20. This movement of the pistoncommunicates in turn an equal and opposite movement to the two blocks 5and 6 (through the medium of the connecting rod 18 and the rack andpinion coupling 11;13-14) thereby bringing these blocks to the closedposition of Fig.

2. As soon as these blocks make contact with each other the motion ofthemain piston 15 is arrested, and the secondary piston 16 is then furtherforced forward against the pressure of the spring 21, thus carrying theshear blade 9 across the opening at the bottom of the blocks andcompletely severing the stream of glass.

As promptly as possible, in synchronism with the movement of the blocks5 and 6 and shear 9, the mold 4 ili the charging position is moved toone sideas, indicated in full lines in Fig. 2, and as soon as this moldhas moved but little more than onehalf its diameter, the mold 4 which isalready in the flow line, just'below this initial position, is'movedupward toward the charging position, as indicated in dotted linesin thesame figure. being withdrawn from the flow line, the stem of the valve22 is'released from the cam 23, and the valve is carried to its openposition by the spring 25 thereby releasing the pressure in the cylinder17 and permit.- ting the parts of the severing and stream supportingdevice to return to their open position (as shown in Fig. 1) under thesuccessive action of the springs 21 and 20.

Druring the time that the blocks have been held in the closed positionof Fig. 2,

the sides and ends of the stream have been slightly chilled by contactwith the surfaces of the blocks, and when the blocks are open thechilled skin so formed on the glass will itself momentarily suppo-rt thestream. The internal heat of the body of the suspended molten mass willhowever almost immediately remelt or resoften this chilled skin, and thestream will then resume its downward flow to the next mold which has bythis time been brought to the charging position. The blocks and shearcan be withdrawn from the stream quite promptly, the time of withdrawalbeing so gaged that the new stream will just miss the mo-ld 4 as it isbeing withdrawn.

All lapping or piling up of the stream during the time that the blocks 5and 6 are in their closed relationship is prevented by the supportingaction of said blocks both on the severed end and` on the sides of thestream, and any laps in the glass or any entraining of air bubblestherein is thus entirely avoided and prevented. When the blocks areopened and the stream of glass resumes its flow, after its chilledsurface has been removed by the action of the internal heat of the mass,the material therefore passes downward to the next mold in practicallythe same'l condition as it emerges from the orifice 2.

In order to prevent too great a chilling action on the end and sides ofthe severed and arrested stream, with the consequent formation of toothick a surface skin of As the mold 4 iscooled and stiffened lass, Iprefer to make the blocks 5 and 6 o' some material which has thewear-resisting qualities of metal, and which has at the same time arelatively low heat conducting capacity. liianganese steel is one such amaterial, and compressed carborundum is another. Under certainconditions I may also use other non-metallic materials which have theabove described characteristics. In 'order to permit of the readyreplacement of these blocks, either because of wear or for otherreasons, they can be made separate from the supports which slide on theways of the frame 10 and which carry also the shear blade 9 and thesynchronizing device 11-13-14.

In order to change the volume of flow of the stream, I provide avertically movable plug, 26; and I also place below the orifice 2 awater-cooled ring 27, whose temperature can be varied, and the viscosityand velocity of outflow of the glass through said ring thereby adjustedto a considerable extent. As the velocity of outflow is changed the sizeof the stream below the orifice will also change, and in order to adjustthe apparatus so that the stream when severed will always be supportedon its side by the blocks, I arrange the support of the entire frame 10,which carries the various parts of the cut olf device, so that it can beadjusted vertically up and down and clamped in any desired position, asby the bolts 28-28 for example. To take care of very large variations inthe flow, I change both the ring 27 and the blocks 5 and 6.

In Figs. 3, 4 and 5 I illustrate another form of mechanism for effectingthe severance of the glass stream and the support thereof during theinterval required for changing the positions of the molds. In theconstruction now to be described, the blocks 30 and 31, which embracethe sides of the stream during the arrest of its flow, are mounted onthe ends of arms 32 and 33, that are pivoted on the frame of the machine(a portion only of this frame being indicated at 10) and are movedsimultaneously and synchronously by the toggle joint links 34 and 35,the latter being actuated in turn by the joint action of the cam 36 andspring 20.

Mounted in the block 31 is a shaft 37 which carries at its lower end ashear blade 9 and a conical nozzle 38 that is connected by a pipe 39 toa cap 40 on the end of the shaft 37. The cap 40 communicates through anopening in the shaft 37 with the interior of aloose coupling sleeve 41,attached to the end of a pipe 42. The lower ends of the shafts carryingthe arms 32 and 33 are provided with similar sleeves which are connectedto the pipe 43; and openings from these sleeves lead upward through thesaid shafts and out through the said arms (see dotted lines in Figs. 3and 5) to communicate with cavities 44 and 45 in the blocks 30 and 31;the passageway in the arm 33 being also in communication with the pipe42. The pipe 43 is connected to a source of compressed air or steam, theflow of which is controlled by a valve 46 which is normally held closedby a spring 47.

The shear blade 9` with its attached parts, is operated independently ofthe block 31 by means of a crank arm 48 and a connecting rod 49 which ismoved longitudinally by the joint action of a cam 50 and a spring 51.

The operation of this second form of cutoff and stream-chillingmechanism is as follows: 'The cam 36, like the cam23, is revolvedconstantly by ay connection with the power shaft of the machine (notshown) at such speed that it makes one complete rotation for eachcomplete cycle of operations, i. e., in the time required to charge onemold, remove it and bring another mold to stream-receiving position. Atthe instant the charging of one receptacle is complet-e, the raisedportion of the cam 36 makes contact with the slide which actuates thelinks 34 and 35 and brings the blocks 30 and 3l together. Simultaneouslywith the closing of the blocks the cam 50 actuates the connecting rod 49and crank arm 48 to swing the shear blade 9 across the lower face of theclosed Iblocks and thus sever the flowing stream of glass g. This bringsthe parts into the position shown in Figs. 4 and 5, with the nozzle 38directly under the freshly severed end of the glass stream. At theinstant of closing of the blocks 30 and 31 the valve 46 is opened, bythe end of the link arm 34, admitting compressed air or steam to thecavities 44 and 45 in the blocks 30 and 31 and also admitting the fluidto the nozzle 38. This air or steam escapes from the perforations in theinner faces of the blocks 30 and 31v (see Fig. 4), in a series ofoverlapping and commingling jets which impinge on the sides of the glassstream, and is also discharged in an upwardly directed jet from thenozzle 38 against the freshly severed end of that stream. Theimpingement of these relatively cool streams of fluid against thesurface of the molten glass chills the surface of the latter; and thissurface chilling, combined with the effect of the pressure exerted bythe jets against both the end and the sides of the stream, momentarilyarrests the flow of said stream while the filled mold is being removedand the next empty mold brought to receiving position. Just before themold movement is completed the slide of thevlink mechanism is releasedfrom engage-ment with the elevated portion of the cam track 36 and theblocks are moved back to their open position by the spring 20.l

During this movement the shear blade 9 and nozzle 38 are still retainedby the cam 50 in the position of Fig. 5 with reference to the block 3'1;and are only allowed to return to their initial position, as shown inFig. 3, after the opening of the blocks has been completed. The air (orsteam) is shut od' from the pipe 43, as soon as the blocks begin toopen, by the action of the spring 47. The removal of the chilling andsupporting effects of the fluid jets impinging on the surface of theglass permits the chilled surface skin of the arrested stream to beresoftened by the internal heat of the molten material, and permits thestream to resume its flow to the next mold.

As has already been indicated, it is always desirable to make theinterval, during which the flow of the stream must be arrested, as shortas possible. This can be best done by `bringing each mold to be filledto a position directly under the 'charging position, where a mold isbeing lled, so that when the latter is charged' and moved to one side byapproximately only one-half of its own diameter the next mold is alreadyin position to receive the stream when it resumes its downward flow.

In Figs. 6, 7, 8 and 9 I have shown, partly in diagram only, one form ofapparatus by which the above mentioned movement of th'e molds may besecured. In the construction there shown or indicated 55 is a rotarymold table provi'ded vwith five arms 56, 56, etc., each of which carriesa mold 57, 57, of the form required for the production 0f any desiredarticle. This mold table is rotated intermittently through one-fifth ofa revolution (by any approved form of mechanism for that purpose) so asto carry the molds successively from the charging position 1 to, andthrough, the following positions II, III, and IV. The molds are held inproper position on vthe arms 56, during these movements, by springlatches or pins 58. right hand side the machine is provided with twofixed L-shaped tracks 59 and 60 so positioned as to engage rollers 61,61, and V 62, 62, on each mold as the latter is carried through thepoint 90 back of the charging position in the movement of the arms 56from position IV to position V. At the instant of passing this 90 point,the catch 58 is retracted, Iby means not shown, and the side of the moldis simultaneously engaged by an arm 63 of the star wheel 64, which is4iso 6.6 the anges of which enter grooves on the bottom plates of themolds 57. The table 65 is mounted on inclined tracks 67, which carry itfrom the full line position of Fig. 7 to the dotted line position onthat same figure, and in this movement bring the mold from position VTto position VTT. ln this last position, the anges 68, 68 on the sides ofthe mold are engaged by the arms 69, 69 (see best Fig. 9) of the forkedhead 70 which is mounted on the upper end of a plunger 71 in thecylinder 72. This plunger 15 is provided with two longitudinal grooves 73 and 74, 90 apart, and connected together at the two ends of thegrooves 73 by the spiral grooves 75 and 76. The upper end of the plunger71 is also provided with a sleeve collar 77 which is pivoted to the longarm 7 8 of an ordinary two-arm straight line linkage, whose purpose isto uide the upper end of the plunger in ine with the bore of thecylinder 72. The short arm 79 of this linkage is extended to form a dogwhich will engage with the lock 80 when the plunger has been raised tothe position shown in Fig. 8, and will hold it in that position againstthe pressure of the actuating fluid on the lower side of the plungerpiston. The compressed air or steam used to operate the plunger isintroduced at thelower end of the cylinder through a pipe 81 containinga three-way plunger valve 8'2, the stem of which is jointly actuated bya cam- 83 and a lever 484 in the manner presently to be described.

The operation of the above described apparatus 1s as follows: The moldat charg- 40 the required quantity of glass has accumulated therein. Theblocks 5 and 6 and shear blade 9 are then operated to sever. and lsupport the stream as shown in Fig. 8. Simultaneousl withf the severingof the stream the mo ta'ble is set in motion carrying the mold atcharging position 1 to the left toward position 11 as shown in Fig. 8.While the mold in the charging position is `be1ng lfilled, an empty moldhas been broughtto the position VITI (shown in dotted lmes in Fig. 7 andin full lines in Fig.. 8) in the manner later to be described; and isheld there b the pressure of air in the cylinder 72 an the lock 80.V Assoon as themold has moved far enough from position 1 to clear the lowermold, the arm 5 6 which carries it is engaged with the dog 8-7 therebyreleasing the lock 8O and allowing the lunger to rise to the top of itsstroke. s the plunger rises, it, together with the head 70 and the moldcarried thereby, is revolved through 90 by the engagementlof the lowerspiral groove 76 with the guide key in the upper cylinder head. This ingposition 1 yis left in that position until` brings the mold into theosition indicated at 1 in Figs. 6 and 7. Tt 1s held in this position onthe plunger head until the empty arm of the mold table advancing fromposition V has come to. restv unde-r it. The three-way valve 82 is thenopened to the atmosphere by the cam 83 and the air in the cylinder 72 isallowed to escape permitting the head 70 and plunger 71 to de- '.scendtoy their lowest position, as shown in 75 Fig. 7. As the plungerdescends, it 1s ro-V tated back 90O to its original position by theaction of the upper spiral groove 75. At the lowest point of its stroke,the head 70 strikes the head of a pin 88, which in turn 8@ releases thecatch 8-9, which holds the carriage 65 at the top of the inclined track67. The release of this catch permits the carriage 65, together with themold which has just before been pushed upon it by the action 85 of thestar wheel arm 63, to slide down the tracks 67 and thus carry the moldfrom position VT to position VIT where it is supported by its sideflanges 68 on the arms 69 v of the head 70. At the lower end of itsmovement, the lug 90 on the carriage 65 engages with' the upperu end ofthe valve lever 84 and opens the pipe" 81 to the compressed air supply.This causes the plunger 71 and head 70 to rise until the upward 95motion is arrested by the lock 80, thus bringing the mold next to befilled to the osition previously described. As the head O rises andlifts the mold from the carriage 65, the latter is permitted to slip outfrom between the forks 69, 69 and return to its upper position (underthe action of the counterweight 91) where it is once more engaged andheld by the dog 89. It is then in position to receive the next moldwhich is brought to it from position V by the next successive movementof the mold table and star wheel 64, in the manner already described.

I do not here claim the particularmode of mold operation by which eachmold is brought to the charging position by moving it under the moldbeing filled and then when the latter is charged, lifting it verticallyWhile ,the iilled mold is moved laterally, as that forms the subject ofa separate application.

'\ It should be understood that while in the drawings l have shown thestream of glass accumulating in the mold, this condition is a functionof time ofrflow and positioning of the mold in the line of flow and thatif the cutting operations are sufficiently close l together, theseparated glass mass will be in the form of a column or gob and that byproperly proportioning the size of the orifice o relative to the size ofthe mold or receptacle, the length of the stream cut away from theoncoming, lass may be ,comparatively short and muc less than thedistance i between the orifice and the mold; all this without in any waydeparting from my invention.

I claim as my invention:

1. That'improvement in the art of glass working, which comprises theestablishment of a downwardly-flowing stream of glass from a source ofsupply into a receptacle, the cutting of said `stream at a point belowbut closely adjacent the upper end ofsaid stream, the application tosaid freshly produced end yof' a stream-embracing cooling elementservin-g to produce, below but in conjunction with the chilled skindepending from 4the orifice, a temporarily chilled stream-supportingenvelop for said freshlyproduced' end immediately preceding a cutting,kand the withdrawal of the lille/d receptacle and presentation of areceptacle in the stream line.

2. rIhat improvement in the art of glass working, which comprisestheestablishment of a downwardly flowing stream ofV glass from a sourceof supply, the cutting of said stream below but adjacent the upper endof the stream, and the temporary application to said stream adjacent itsupper end of a stream embracing and chilling member to temporarilyproduce, below but in conjuncltion with the chilled skin depending fromthe orifice a stream-retar'ding envelop for said stream immediatelypreceding a cutting.

3. That improvement in the art of glass working, which comprises theestablishment of a stream of glass norm-ally flowing from a source ofsupply, the cutting of said stream adjacent the source so as to leave anexposed portion of the stream, and the temporary application to saidexposed portion of a stream embracing chilling member serving toproduce, below but in conjunction with the chilled skin depending fromthe orifice a ow-retarding temporarily-chilled envelop for said exposedstream portion immediately preceding a cutting.

4. A glass working machine comprising, cutting mechanism, and superposedstreamembracing members relatively -movable to momentarily symmetricallyembrace a stream of glass to form a temporarilychilled flow-retardingenvelop for the stream without materially swelling, and to thereaftercut the same below the embracing means.

5. In glass working apparatus, the combination with means to establish astream of glass flowing from a source` of supply, of a pair ofstream-embracing chilling-members arranged adjacent said lstream at itsemanation in position to form a temporarilychilled flow-retardingsymmetrical envelo for the stream as the stream is severe means forshifting said stream-embracing members toward and from the stream line,a cutting member arranged beyond the streamembracing members, and meansfor operating said cutting member in synchronism with thestreamvembnacing means to intermittently sever the glass stream.

6. In glass Working apparatus, the combination with means to establish astream of glass flowing from a source of supply, of a pair ofstream-embracing chilling members arranged adjacent said stream at itsemanation in position to form a temporarilychilled How-retardingsymmetrical envelop for the stream as the stream is severed, means forshifting said stream-embracing members toward and from the stream line,a cutting member arranged beyond the streamembracing members, and meansfor operating said cutting member to intermittently sever the glassstream:

7. In a glass working machine, the combination of a pair ofstream-embracing members having an ei'ective diameter substantiallyequal to the stream in the plane thereof, means for moving saidembracing members toward and from an intermediate stream line, a shearblade carried by one of said members and coperating with theY othermember, and means for moving said shear blade independently of theembracing member.

8. In a glass Working machine, the'combination with means forestablishing a stream of glass flowing from a source of supply, a pairof stream-embracing members arranged upon opposite sides of said streamadjacent its source and having an effective diameter substantially equalto the stream in the plane thereof, means for moving saidstream-embracing members toward and from the stream line, a shear bladecarried by one of said embracing members and co- 105 operating With theother, and means for shifting said shear blade independently of thestream-embracing members. i 9. In a glass working machine, astreamembracing member having an open bottom, a shear blade movableacross said open bottom to shear a stream -passing through said v streamembracing member, a nozzle associated with said members and movable intoalinement beneath the open bottom of the stream-embracing membersubsequent to the traverse of the shear blade, and means for directingan upward blast of gas from said nozzle into the lower end of thestreamembracing member. 10. In an apparatus of the class described, apair of relatively movable gathering elements, a severing elementmovably positioned beneath the gathering elements, a

severing margin-on one of said gathering and beyond the inner margin ofthe opposite gathering element in its other limit of movement.

11. In an apparatus of the class described, a pair of relatively movablegathering elements, a severing element movably positioned beneath thegathering elements, a severing margin on one of said gathering elements,means for moving the gathering elements toward and aWay from each other,

means for moving the severing element in its one limit of travel beyondthe said severingV margin of the one gatherin element and beyond theinner margin ot the opposite gathering element in its other limit ofmovement, and means for holding the last-mentioned gathering element toits inner limit of movement during a part of the time occupied 'bythe'withdrawal of the said severing element.

In Witness whereof I have hereunto set my hand at Pittsburgh,Pennsylvania, this 23d day of April, A. D. one thousand nine hundred andfourteen.

FRANK L. O. WADSWORTH. Witnesses:

M. M. SCHINNEILER, SUE B. FRITZ.

